Die



iv J3 DIE | B. STOGNER, s R

Filed Sept. 5, 1953 Dec. 18, 1934.

I Zazfirezce 5, ,9

Guam

Patented Dec. 18, I934 UNITEDtJSlTATBS' This invention relates to diesand more particularlyjto combination cutting. and drawing dies, such asare employed, for example,.in forming cup-shaped articles from 5material. 1 g

The general object of the invention is to provide a novel and improveddie. of this character, and a novel method of forming articles of thetype referred to, by the utilization of such a' die or similarinstrumentalities.

In its preferred emb blanks of sheet diment, my invention contemplatesthe provision of acombination die which is-well adapted toform-aperforatedcup shapedarticle such as a ribbon tbox cap, from ablank composed of paper, sheet metalor thedike.

.This die comprises an upper die member-and a- 1 lower die member, theformer comprising,v ,a, punch having an outer disc-cutting member, and a:drawing or forming member .having: associated therewith means forbulging or convex,-

ing the bottom of'the'cap and bending the blank at an acute angle atthe.peripheral junction of the walls and the bottom thereon .This is ,donein order to counteract the resilientror expansive tendency of thematerial to resume its original shape, and thus to insure that the wallsof the finished cap will' be substantially perpendicular ,to the planeofthe bottomthereof. Preferably, there is also associated with the drawingmember, a perforating punch for providingsaicentrally located opening inthe bottomof the-cap; this punch being either formed integrally-with orsecuredto the drawingmember, or adapted to be independently operatedasan associated .die element.

The combinationdie also includes a-lowendie ,member which is providedwith elementstwhich arev adapted; to, cooperate respectively withsthecutting, drawing, shaping, and hers on punching memthe upper. die. v Thearrangement, in the preferred form, is such that these cooperating itheachother in the proper elements are brought-into-operative relation ordesirable -se provided-tor ejecting the shaped article. from the die.

Other objects and features of novelty will be apparent from thefollowing; specification when read in connection with theaccompanyingdrawing in which certain embodiments of my invention areillustrated by way of example.

'wIn the'drawing:

. Figure llis a vertical.sectionalwiewzthrough the axes of the dies. cfapunch- .thexprinciples'ofsmykinvention;

press-embodying ring: ZOIbythe :upper 'die member. 25.

viewon.an..-enlarged scaleuof -a ribbon box. cap

such as 2iszadapted to beformed' by thecombina- .tion'idiei'llustratediin Figures '1.-4 inclusive; and

Figure 6 is a fragmentary vertical cross-secemechanisrrr.associatediwith ithe .lower 'die.

I i'InrFi'guresi'il'randi2 o'f ithe drawingizthe lower -:die:.lmember:is indicated generally :"by the nuz-meral. '19.. Thisamemberzisgin theform: of a metal block xwhicnais'iprovided' withiiears -or lugs 11 by'me'ansslof whichcit tmayibe bolted to the bolster 011 frame. szofnthe:punch... press. A portion of I the irameooriblster .of f "the ."pressis' showrr at' 12, in Figure 1 liand, iifo'rs all :practical purposes,this portion of the frame mayi be 'considered as part .ofthelowerxidiean emberiand'iwill be? described andriclaimed :as such.This member 12 could 'very readily'zrbeamade.integral with the block.-l0,' but for convenience, itfiisformed as a sepa- ,'ratememberzinsithegpresent embodiment.

The-lupper diemember 'or punch is designated :generallyb'yl'the'tnumeral l and is adapted to be Jreciprocated vertically bysuitable operated :mechanism (not shown), "to certain parts of zwhichit:may' be connected asbymeans of the ,threadedmo'rtions l6 and '17. -Asalready indiicated, this combinationz'cdie, isiadapted to perform"several sequential or: simultaneous opera- -tions .vupomavblankpf sheetmaterial during a single sstrokei or cycle" of 1 operation. The first'of theseoperations comprisescutting outi-aa: circularvdisc'irom thesheet of material which is interposed between .the lower and upper diemembers and 15. The lower member 10 fiisvprovided with a hardened:annularxinsert .20 which is fitted within a circular central openinginithegmember l0and-secured as by means of pins onscrews 21. This"cutting ring'20 is provided 'withnan annular -"cutting edge 22 withwhich-the cutting edge123xof the cutting member -25 ofwtheiiupper-die 15is adapted to cooperate. The operation of'these parts will bereadilyunderstood. Aszthecombined upper: die mem- :ber descends, the cuttingedges. 22 and.2 3 will shear aldisc'from the interposed sheet materialjandthe disc :iscarried down within the cutting Disposed within thecentral opening in the lower die member 10 and beneath the cutting ringis a drawing ring 27. This drawing ring is of a smaller internaldiameter than the cutting ring 20 and is provided with a curved drawingedge 28 at its upper end. The descent of the cutting portion of theupper die 15 is halted before-the lower edge thereof reaches the upperend of the drawing ring 27, but the central portion 30 of the upper diecontinues to descend and, as it moves past the drawing edge 28 of thering 27, the central portion of the blank is forced downwardly and theperipheral portion thereof is swaged or bent upwardly to form thevertical annular walls or flanges of the cup shaped article 50,illustrated, for example, in Figure 5 of the drawing.

The inner portion of the upper die 15 continues to descend and carriesthe cup shaped article downwardly past the lower end of the drawing ring27 until the bottom 51 of the cup 50 is pressed against the convex,substantially frusto-conical, central surface 32 of the insert plate 33carried by the member 12. This plate 33 is provided with a centralopening 34 surrounded by a cutting edge 35 which cooperates with thecentral protuberance 36 formed on the otherwise concave bottom surface37 of the drawing plunger 30 of the upper die. It will be seen that thepunch protuberance 36 serves to perforate the central portion of thebottom 51 of the cup ,50 as shown at 54.

At substantially the same time the cooperating concave and convexconical surfaces of the two die members serve to temporarily bulge thebottom 51 upwardly and form an acute angle at the peripheral junction 53of the side walls 52 and the bottom 51. The application of this extremestress to the'cup 5.0;,is only temporary and serves to counteract theresilience or expansive tendencies of the cup which wouldcause the walls52 to flare outwardly instead of being perpendicular to thebottom 51.

Upon withdrawing the upper die member 15, the cup will be stripped fromthe lower end of the plunger 30 by means of the lower stripping edges 39of the drawing ring 27. The plate 33 is spaced downwardly from the ring27 and a slot 40 is provided in the lower die member 10 for the lateralor horizontal ejection of the completed cup element 50. As illustratedin Figure 1, a horizontally reciprocating ejector head 42 having a stem43 is adapted to be actuated by suitably timed mechanism (not shown) topush the completed cup through the slot 40 and out of the press. In lieuof this mechanical ejecting arrangement, there may be provided meanssuch as is shown in Figure 6 which comprises a conduit 45 formed in themember 10 and placed intermittently in communication with a source ofcompressed air. The blast of air 46 issuing from the conduit 45 willserve to discharge the completed cap 50 through the slot 40.

In Figure 4 the centrally disposed perforating punch 36" is separablefrom the drawing die member 30; being fitted within a drilled recess 43therein and retained by means of the set screw 47. In this way the punch36' may be adjustably secured with relation to the other elements of theupper die member.

A still further modification of this device is indicated in Figure 3 ofthe drawing, in which the punch 36 extends through the center of theupper die member 15 and is connected at its upper end with a separateactuating member (not shown) which may be suitably synchronized with theoperation of the other portions of the die so as to perforate the bottomof the blank at the proper instant.

The concave portion 37 of the bottom of the drawing member 30 not onlyperforms the crimping or bending function already described, but enablesthe formation of the perforating punch portion 36 upon this surface sothat it does not j project so far beyond the plane of the peripheraledges of the member 30 as to distort the bottom of the blank downwardlyto a too great extent during the descent of the upper die member. Infact, in some cases, the lower end of the element 36 may be disposed inthe same plane as the lower peripheral edge of the member 30.

A still further variation in the arrangement may be effected byproviding an opening in the lower end of the member 30 instead of theprojection 36 and providing a perforating punch or plunger associatedwith the lower die member 10 so as to reciprocate through the centralopening 34 in the plate 33.

It will be readily seen that the combination die or punch which has justbeen described is of simple, sturdy construction and very well adaptedto form cup shaped articles of the type illustrated in Figure 5;insuring that the perforation 54 is properly centered with respect tothe article and that the walls 52 will be perpendicular to the base orbottom portion 51. Of course, the die may be employed in operating uponsheet material of any variety whether of pasteboard, metal or othersubstances.

Further modifications and changes may be made in the embodimentillustrated and described herein without departing from the scope of theinvention as defined in the following claims.

Having thus described the invention, what is claimed as new and desiredto be secured by Letters Patent is:

1. A combination die of the class described including, in combination:an upper die comprising an outer annular cutting member, an intermediatedrawing punch provided with a substantially concave bottom surface; alower die comprising an outer annular cutting ring, an intermediatedrawing ring and a convex upwardly facing surface within said drawingring adapted to cooperate with the concave bottom surface of said punchto temporarily apply a bulging strain to the article being formed, saiddrawing ring being provided with lower stripping edges; means forcausing the several elements of said upper die to cooperate respectivelywith those of the lower die; and means below said stripping edges andabove said convex surface for ejecting the formed article laterally.

2. A combination die of the class described including, in combination:an upper die comprising an outer annular cutting member, an intermediatedrawing punch provided with a substantially concave bottom surface, anda centrally disposed perforating projection; a lower die comprising anouter annular cutting ring, an intermediate drawing ring, and a convexupwardly facing surface within said drawing ring adapted to cooperatewith the concave bottom surface of said punch to temporarily apply'abulging strain to the article being formed,

said convex surface provided with a central perforating opening, andsaid drawing ring being 7 provided with lower stripping edges; means forcausing the several elements of said upper die to cooperate respectivelyand successively with those of the lower die, in the order named; andmeans below said stripping edges and above said convex surface forejecting the formed article laterally.

3. A combination die of the class described including, in combination:an upper die comprising an outer annular cutting member, an intermediatedrawing punch provided with a substantially concave bottom surface, anda centrally disposed perforating punch, said cutting, drawing, andperforating members being vertically movable relatively to each other; alower die comprising an outer annular cutting ring, an intermediatedrawing ring, and a convex upwardly facing surface within said drawingring adapted to cooperate with the concave bottom surface of said punchto temporarily apply a bulging strain to the article being formed, saiddrawing ring being provided with lower stripping edges, and said lastnamed surface provided with a central perforating opening; means forcausing the several elements of said upper die to cooperate respectivelywith those of the lower die, and means below said stripping edges andabove said convex surface for ejecting the formed article laterally.

' 4. A combination die of the class described comprising, incombination: an upper die member' having an outer annular sleeveproviding a disc cutting member, an intermediate drawing and shapingpunch having a substantially concave bottom surface, and a centrallydisposed perforating punch; a lower die member having an elevatedcutting ring adapted to cooperate with said disc cutting member, adrawing ring of smaller diameter than said cutting ring, concentrictherewith, and disposed below said cutting ring; a lower stripping edgeon said drawing ring, a bottomplate forminga part of said lower die,disposed beneath and spaced from said drawing ring, and. provided with aconvex surface adapted to cooperate with the concave surface of saidupper die to temporarily apply a bulging strain to the article beingformed, and a centrally located opening having cutting edges adapted tocooperate with said perforating punch; and a lateral ejector adapted tooperate in the space between said drawing ring and said bottom plate.

5. A combination die as set forth in claim 1, in which the ejectingmeans comprises a transversely movable plunger.

LAWRENCE B. STOGNER, SR.

